Create and display Doubly circular link list in c++ code

 Hi, guys code for creating and displaying doubly circular link list using c++ given below

#include<iostream>
using namespace std;
struct node {
    int data;
    node *next;
    node *prev;
};
struct node *tail,*head;
/*creating doubly circular link list*/
void createdcll() {
    node *newnode;
    int choice;
    head=0;
    while(choice!=0)
    {
        newnode=new node;
        cout<<"enter the dcll data"<<endl;
        cin>>newnode->data;
        if(head==0) {
            head=tail=newnode;
            head->next=head;
            head->prev=head;
        }
        else {
            tail->next=newnode;
            newnode->prev=tail;
            newnode->next=head;
            head->prev=newnode;
            tail=newnode;
        }
        cout<<"u wanna continue";
        cin>>choice;
    }
}
/*display doubly circular link list*/
void displaydcll() {
    cout<<"this is display"<<endl;
    node *temp=head;
    if(tail==0)
    {
        cout<<"empty list";

    }
    else {
        while(temp!=tail)
        {
            cout<<"data"<<temp->data<<endl;
            temp=temp->next;
        }
        cout<<"data"<<temp->data<<endl;
    }
}
main() {
    createdcll() ;
    displaydcll() ;

}